Add FPGA Manager driver. This driver allows to program FPGA core
from FreeBSD userspace running on ARM core.

Sponsored by:	DARPA, AFRL
Avoid ctld(8) crash on getaddrinfo(3) failure.

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Merge remote-tracking branch 'freebsd/master' into hardened/current/segvguard